Oscar-winning director Steven Spielberg, actor-producer Ashton Kutcher and reality TV impresario Mark Burnett are just a few of the Hollywood heavyweights trying to develop new programs for the Web.
Yet for all their success in television and movies, they are grappling with a fundamental question: What defines a hit on the Internet?
"There are as many answers to that question as people you ask it to," said Blair Westlake, a former TV executive who is Microsoft Corp.'s liaison to the entertainment industry.
That confusion became all the more apparent Thursday when Yahoo Inc., an early favorite to navigate the complex 21st century media landscape, said it would scale back efforts to create original entertainment offerings. The decision was a turnaround for Lloyd Braun, the former ABC television executive hired in 2004 to run the company's Santa Monica-based Yahoo Media Group.
For months, Braun spread the word that he wanted to capture mass audiences by producing new Web programming to be seen only on Yahoo. With Thursday's shift, Braun acknowledged that his views about what it took to succeed online had changed.
"Our focus is not doing a string of one-off hits like the TV model," said Yahoo spokeswoman Joanna Stevens, who added that the company would instead highlight content created by its millions of users as well as serve as an online distributor for traditional media companies.
Braun declined to comment.
Yahoo will still create the occasional original program, Stevens said. But the company has put the brakes on big-ticket projects such as "The Runner," a onetime TV show concept Braun brought with him from ABC, and "Treasure Hunt," an online game show developed with Spielberg's production company, until it can figure out how to make money on such deals.
"Unless show business stops being a business, then ... you need to be able to find a commercial audience," said Scott Zakarin, who produced one of the first popular entertainment websites, the Spot, in 1995 and is developing Web-based shows.
As online video matures, the Internet has become a hip place to launch shows and squeeze more money out of old ones. TV networks, Internet portals and television producers chasing ad dollars online are developing reality shows, comedies and scripted dramas specifically for the new medium.
For the big Internet companies, their "hits" have been e-mail, Web search, instant messaging and other services that keep people coming back regularly, said advertising executive Jeff Lanctot. Now, they are trying to build even bigger audiences with video programming.
Few of their efforts have resonated, however, with the Web's notoriously fickle taste makers.
Most clips that do become sensations never make a dime. A video of two Chinese students lip-syncing to American pop music became as widely e-mailed as any clips created by traditional media.
Developing a hit show has always been an imprecise mix of prescience and dumb luck. In the network television business, which has been at it for more than 60 years, shows that attract 10 million viewers are generally considered successes. During the week of Feb. 20, 25 shows pulled in at least that many viewers, led by "American Idol" with 31.7 million.
In contrast, the Internet has become a viable way to distribute video to the masses only in the last year or so, and Web shows have little hope of drawing the numbers of viewers that TV can.
That's because the number of U.S. households with fast Internet connections is half that of households with televisions, streaming video still isn't as reliable as TV broadcasts and big Web companies can stream live video to only a few hundred thousand viewers at one time.
The interactive nature of the Internet also makes it hard to cut through the clutter and find an audience. With cheap cameras and software, people can post homemade programs online to compete with slicker offerings from established producers.
"If you're trying to create 'I Love Lucy' on the Internet, I wouldn't want to be in that business," said Joel Wright, a former Yahoo executive who last year founded SlingShot Media, a talent agency for digital projects.
Undaunted, many top Hollywood producers are creating "webisodes" and other entertainment fare for such distributors as NBC Universal, Fox Broadcasting, America Online and Yahoo.
Those distributors hope to cover their costs with advertising revenue.
Online advertising is growing as advertisers are placing commercials in front of music videos, news stories and other video clips.
But video ads still contributed only $225 million of the $12.9 billion in U.S. Internet ad revenue last year, according to research firm EMarketer Inc.
By contrast, broadcast, cable and local TV ads pull in $60 billion a year. But ad dollars aren't the only way to recoup investments in Web programming. Amazon.com Inc., the e-commerce giant, is developing a TV-style talk show specifically for its website.